The SLE-1001 sight glass monitor fromKMC Controls(New Paris, IN) can be electronically monitored through the company's KMDigital controller or other building management systems that accept 0 to 5-vdc signals. The SLE-1001 has a power supply of 24 vac, +20/-15%, 50/60 Hz at 1.5 VA, and features a black water and dust-resistant, flame retardant polymer housing.